Electric cable



- May 31, 1938. E. H. LEWIS Er L 2,119,394

ELECTRIC 0mm:

-' Filed Dec. 18," 1934 BRA|D RUBBER COTTON CONDUCTOR Inventors: EdwardH.Lewis.

Cliffovgl O. Hull, )0 fig/wf PH Their Attorne y.

Patented May 31, 1938 PATENT OFFICE ELECTRIC CABLE Edward H. Lewis,Union, N. .L, and cumin 0. Hull, Stratford, (lonn assignors to GeneralElectric Company, a corporation of New York Application December 18,1934. Serial N .,758,012

2 Claims.

Our invention relates to an electric cable and more particularly to acable with an overall fibrous braid which will not fray back from theend of the cable.

An object ofour invention is to provide an improved electric cable inwhich the outer covering of braid will not become loose and fray backfrom the end while the cable is in use.

What we consider to be novel and our invention will be better understoodby reference to the following specification and appended claims whenconsidered in connection with the accompanying drawing in which thesingle figure is a side elevation of our improved cable showing thelayers of insulation. In cable provided with an overall rubber jacketcovered with a fibrous braid difiiculty has been experienced due to thefact that the rubber jacket has a smooth exterior surface over which thebraided covering is formed. The braided covering at its free end movesfreely over the surface of the rubber and is loosened in use and in thecourse of time the braided covering begins to fray back from the end. Toprevent the loosening of thebraided covering when it is applied'over arubber jacket, we have provided a plurality of closely arranged ribs onthe surface on the rubber jacket which presents 'a'high friction surfaceto the braid and thus prevents the loosening and fraying back of thebraid.

In the drawing, l and I I indicate two stranded conductors. Over theconductors Wand ll cotton coverings I 2 and [3 are provided which areformedby cotton strands laid longitudinally around the conductors. Itmay be found desirable to form the cotton coverings I2 and i3 by a braidor winding. Over the cotton coverings l2 and I3 layers of rubberinsulation l4 and I5 are provided. Over'the combined conductors andinsulation on overall rubber jacket I6 is provided rubber Jacket IS afibrous braid I1 is formed. Due to the ribbed surface on the jacket Hithe braidil tightly engages the jacket I6 and does not become loosenedwith use and so will not fray back from its free end. It may also be 5found desirable where a single conductor with a rubber jacket is coveredwith a braid to form the surface of the Jacket with ribs to preventloosening of the braid from the single conductor and its insulation. Itis believed that longitudi- 1 nal ribs will more efliciently prevent theloosening of the braid but it may be found satisfactory in some cases touse ribbed surfaces which extend spirally over the jacket or in anyother irregular form.

From the foregoing it may be seen that an improved cable is providedwith a rubber jacket covered by a braid which will not become loosenedwith the useof the cable.

What we claim as new and desire to secure by Letters Patent of theUnited States is:

1. An electric cable comprising a conductor, a rubber covering over theconductor having a plurality of small continuous ribs extendingthroughout its length and which are closely ar- 5 ranged, and a fibrouscovering braided tightly over the rubber covering whereby the ribsprevent the ready loosening and fraying back of the braid. v

2. An electric cable comprising a plurality of 0 conductors, an,insulating covering over each conductor, a' rubber jacket over thecombined conductors having a plurality of small continuous longitudinalribs extending throughout its length and which are closely arranged, anda fibrous covering braided tightly over. the rubber jacket whereby theribs prevent the ready loosening and fraying back of the braid.

EDWARD H. LEWIS. 40 CUFFORD o. HULL.

